# CVE-2023-4489

## Summary

- **CVE ID:** CVE-2023-4489
- **Severity:** MEDIUM
- **CVSS Score:** 6.4 (CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-1279
- **Published:** Dec 14, 2023
- **Last Modified:** Mar 13, 2026

## Description

The first S0 encryption key is generated with an uninitialized PRNG in Z/IP Gateway products running Silicon Labs Z/IP Gateway SDK v7.18.3 and earlier. This makes the first S0 key generated at startup predictable, potentially allowing network key prediction and unauthorized S0 network access.

## Affected Products

- silabs.com — Z/IP Gateway SDK (0)

## References

- [CNA](https://siliconlabs.lightning.force.com/sfc/servlet.shepherd/document/download/0698Y00000buWj0QAE?operationContext=S1)
- [CNA](https://github.com/SiliconLabs/gecko_sdk)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.69%
- **EPSS Percentile:** 71.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._